P-XYLENE (DATA PAGE)

This page provides supplementary chemical data on ''p''-xylene.

Contents

Material Safety Data Sheet

Structure and properties

Thermodynamic properties

Vapor pressure of liquid

Distillation data

Spectral data

References

Material Safety Data Sheet

★ Fisher Scientific

Structure and properties

Structure and properties
Index of refraction, ''n''D	1.4958 (20 C)
Dielectric constant, εr	2.2 ε0 at 20 °C
Surface tension[1]	29.92 dyn/cm at 5°C 28.27 dyn/cm at 20°C 24.2 dyn/cm   at 60°C
Viscosity[2]	0.7385 mPa·s at 10°C 0.6475 mPa·s at 20°C 0.5134 mPa·s at 40°C 0.3519 mPa·s at 80°C 0.2424 mPa·s at 130°C

Thermodynamic properties

Phase behavior
Triple point	286.3 K (13.15 °C), ? Pa
Critical point	617 K (344 °C), 3500 kPa
Std enthalpy change of fusion, Δfus''H''o	17.1 kJ/mol
Std entropy change of fusion, Δfus''S''o	59.8 J/(mol·K)
Std enthalpy change of vaporization, Δvap''H''o	35.7 kJ/mol at 138°C
Std entropy change of vaporization, Δvap''S''o	? J/(mol·K)
Solid properties
Std enthalpy change of formation, Δf''H''osolid	? kJ/mol
Standard molar entropy, ''S''osolid	? J/(mol K)
Heat capacity, ''cp''	? J/(mol K)
Liquid properties
Std enthalpy change of formation, Δf''H''oliquid	–24.4 kJ/mol
Standard molar entropy, ''S''oliquid	247 J/(mol K)
Enthalpy of combustion, Δc''H''o	–4552 kJ/mol
Heat capacity, ''cp''	181.7 J/(mol K)
Gas properties
Std enthalpy change of formation, Δf''H''ogas	179.6 kJ/mol[3] at 25°C
Standard molar entropy, ''S''ogas	? J/(mol K)
Heat capacity, ''cp''	163.2 J/(mol K) at 120°C
van der Waals' constants[4]	a = 3134 L2 kPa/mol2 b = 0.1809 liter per mole

Vapor pressure of liquid

'P in mm Hg'	1	10	40	100	400	760
'T in °C'	–8.1	27.3	54.4	75.9	115.9	138.3

Table data obtained from ''CRC Handbook of Chemistry and Physics'' 44th ed.

Distillation data

'Vapor-liquid Equilibrium for ''p''-Xylene/''o''-Xylene'[5] ''P'' = 26.66 kPa BP Temp. °C % by mole ''p''-xylene liquid vapor 100.1 0.0 0.0 99.8 4.9 5.8 99.5 9.9 11.8 99.0 17.4 20.7 98.5 25.1 29.3 98.1 32.6 37.1 97.6 40.6 44.9 97.2 48.6 53.8 96.7 56.9 61.8 96.2 64.9 69.6 95.8 73.1 77.3 95.4 81.4 84.5 94.9 90.7 91.6 94.6 95.4 96.0 94.4 100.0 100.0

'Vapor-liquid Equilibrium for ''p''-Xylene/''m''-Xylene' ''P'' = 26.66 kPa BP Temp. °C % by mole ''p''-xylene liquid vapor 95.30 0.0 0.0 95.20 8.3 8.5 95.15 15.5 15.8 95.05 24.3 24.9 95.00 33.0 33.6 94.90 40.9 41.7 94.85 49.0 49.7 94.75 57.1 57.9 94.70 65.3 66.1 94.60 73.8 74.3 94.55 81.7 82.2 94.50 89.5 89.9 94.45 94.8 94.8 94.40 100.0 100.0

'Vapor-liquid Equilibrium for ''p''-Xylene/carbon tetrachloride' ''P'' = 760 mm Hg BP Temp. °C % by mole carbon tetrachloride liquid vapor 136.4 1.7 5.9 131.1 6.3 21.6 126.2 11.1 34.9 121.8 15.7 45.3 117.6 20.3 53.9 113.5 25.2 61.6 109.8 30.1 67.9 106.2 35.1 73.1 102.7 40.5 77.9 102.2 41.3 78.7 98.1 48.5 83.6 94.4 55.8 87.6 91.1 62.9 90.8 88.0 70.1 93.4 85.2 77.2 95.4 82.6 84.0 96.9 80.0 91.1 98.4 77.6 97.7 99.7

'Vapor-liquid Equilibrium for ''p''-Xylene/Butanone' ''P'' = 760 mm Hg BP Temp. °C % by mole butanone liquid vapor 129.45 4.8 20.8 125.42 7.9 31.7 123.25 10.2 38.1 116.80 16.1 51.1 112.44 21.0 59.4 105.55 30.5 71.0 101.15 38.7 75.5 95.30 50.6 85.2 93.90 54.6 87.2 89.45 67.0 91.7 86.55 77.0 94.7 85.02 81.5 95.9 84.58 83.1 96.2 80.65 97.0 994   'Vapor-liquid Equilibrium for ''p''-Xylene/Aniline' ''P'' = 745 mm Hg BP Temp. °C % by mole ''p''-xylene liquid vapor 171 7.5 37.0 165 14.0 50.0 156 26.5 67.5 148 48.5 80.0 142 72.5 89.0 140 83.0 92.0

Spectral data

UV-Vis
Spectrum
λmax	? nm
Extinction coefficient, ε	?
IR
Spectrum	NIST
Major absorption bands	793.94 cm−1
NMR
Spectrum	AIST
Proton NMR	2.296, 7.046
Carbon-13 NMR	134.66, 128.97, 20.90
MS
Spectrum	NIST
Masses of main fragments	106, 91, 77

References

1. ''Lange's Handbook of Chemistry'', 10th ed, pp 1661-1663
2. ''Lange's Handbook of Chemistry'', 10th ed, pp 1669-1674
3. Pure Component Properies
4. ''Lange's Handbook of Chemistry'' 10th ed, pp 1522-1524
5. Binary Vapor-Liquid Equilibrium Data


★ NIST Standard Reference Database

★ University of Akron, Chemistry Department, Chemical Database

★ National Institute of Advanced Industrial Science and Technology
Except where noted otherwise, data relate to standard ambient temperature and pressure.
applies.